Dockerfile

FROM ubuntu
RUN apt-get update
RUN echo "mysql-server mysql-server/root_password password mysqlpswd" | 'debconf-set-selections'
RUN echo "mysql-server mysql-server/root_password_again password mysqlpswd" | 'debconf-set-selections'
RUN echo "postfix postfix/mailname string localhost" | 'debconf-set-selections'
RUN echo "postfix postfix/main_mailer_type string 'Internet Site'" | 'debconf-set-selections'
RUN apt-get install -y rsyslog postfix postfix-mysql dovecot-common dovecot-pop3d dovecot-imapd openssl dovecot-mysql mysql-server
ADD postfix /etc/postfix
ADD dovecot /etc/dovecot
ADD mailschema.sql /
RUN chmod a+r /mailschema.sql
RUN groupadd -g 5000 vmail && \
    useradd -g vmail -u 5000 vmail -d /home/vmail -m && \
    chgrp postfix /etc/postfix/mysql-*.cf && \
    chgrp vmail /etc/dovecot/dovecot.conf && \
    chmod g+r /etc/dovecot/dovecot.conf

RUN postconf -e virtual_uid_maps=static:5000 && \
    postconf -e virtual_gid_maps=static:5000 && \
    postconf -e virtual_mailbox_domains=mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf && \
    postconf -e virtual_mailbox_maps=mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf && \
    postconf -e virtual_alias_maps=mysql:/etc/postfix/mysql-virtual-alias-maps.cf,mysql:/etc/postfix/mysql-email2email.cf && \
    postconf -e virtual_transport=dovecot && \
    postconf -e dovecot_destination_recipient_limit=1 && \
    # specially for docker
    postconf -F '*/*/chroot = n'

RUN echo "dovecot   unix  -       n       n       -       -       pipe"  >> /etc/postfix/master.cf && \
    echo '    flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -d ${recipient}' >> /etc/postfix/master.cf

ADD start.sh /start.sh  

# default config
ENV DB_HOST localhost
ENV DB_USER root 

# SMTP ports
EXPOSE 25
EXPOSE 587  
# POP and IMAP ports  
EXPOSE 110
EXPOSE 143
EXPOSE 995
EXPOSE 993

CMD sh start.sh